// THIS FILE IS PART OF WinFormium PROJECT
// THE WinFormium PROJECT IS AN OPENSOURCE LIBRARY LICENSED UNDER THE MIT License.
// COPYRIGHTS (C) Xuanchen Lin. ALL RIGHTS RESERVED.
// GITHUB: https://github.com/XuanchenLin/NanUI


using WinFormium.CefGlue.Interop;

namespace WinFormium.CefGlue;
/// <summary>
/// Implement this interface to handle events related to browser life span. The
/// methods of this class will be called on the UI thread unless otherwise
/// indicated.
/// </summary>
public abstract unsafe partial class CefLifeSpanHandler
{
    private int on_before_popup(cef_life_span_handler_t* self, cef_browser_t* browser, cef_frame_t* frame, cef_string_t* target_url, cef_string_t* target_frame_name, CefWindowOpenDisposition target_disposition, int user_gesture, cef_popup_features_t* popupFeatures, cef_window_info_t* windowInfo, cef_client_t** client, cef_browser_settings_t* settings, cef_dictionary_value_t** extra_info, int* no_javascript_access)
    {
        CheckSelf(self);

        var m_browser = CefBrowser.FromNative(browser);
        var m_frame = CefFrame.FromNative(frame);
        var m_targetUrl = cef_string_t.ToString(target_url);
        var m_targetFrameName = cef_string_t.ToString(target_frame_name);
        var m_userGesture = user_gesture != 0;
        var m_popupFeatures = new CefPopupFeatures(popupFeatures);
        var m_windowInfo = CefWindowInfo.FromNative(windowInfo);
        var m_client = CefClient.FromNative(*client);
        var m_settings = new CefBrowserSettings(settings);
        var m_extraInfo = CefDictionaryValue.FromNativeOrNull(*extra_info);
        var m_noJavascriptAccess = (*no_javascript_access) != 0;

        var o_extraInfo = m_extraInfo;
        var o_client = m_client;
        var result = OnBeforePopup(m_browser, m_frame, m_targetUrl, m_targetFrameName, target_disposition, m_userGesture, m_popupFeatures, m_windowInfo, ref m_client, m_settings, ref m_extraInfo, ref m_noJavascriptAccess);

        if ((object)o_client != m_client && m_client != null)
        {
            *client = m_client.ToNative();
        }

        if ((object)o_extraInfo != m_extraInfo)
        {
            *extra_info = m_extraInfo != null ? m_extraInfo.ToNative() : null;
        }
        
        *no_javascript_access = m_noJavascriptAccess ? 1 : 0;

        m_popupFeatures.Dispose();
        m_windowInfo.Dispose();
        m_settings.Dispose();

        return result ? 1 : 0;
    }

    /// <summary>
    /// Called on the UI thread before a new popup browser is created. The
    /// |browser| and |frame| values represent the source of the popup request.
    /// The |target_url| and |target_frame_name| values indicate where the popup
    /// browser should navigate and may be empty if not specified with the
    /// request. The |target_disposition| value indicates where the user intended
    /// to open the popup (e.g. current tab, new tab, etc). The |user_gesture|
    /// value will be true if the popup was opened via explicit user gesture (e.g.
    /// clicking a link) or false if the popup opened automatically (e.g. via the
    /// DomContentLoaded event). The |popupFeatures| structure contains additional
    /// information about the requested popup window. To allow creation of the
    /// popup browser optionally modify |windowInfo|, |client|, |settings| and
    /// |no_javascript_access| and return false. To cancel creation of the popup
    /// browser return true. The |client| and |settings| values will default to
    /// the source browser's values. If the |no_javascript_access| value is set to
    /// false the new browser will not be scriptable and may not be hosted in the
    /// same renderer process as the source browser. Any modifications to
    /// |windowInfo| will be ignored if the parent browser is wrapped in a
    /// CefBrowserView. Popup browser creation will be canceled if the parent
    /// browser is destroyed before the popup browser creation completes
    /// (indicated by a call to OnAfterCreated for the popup browser). The
    /// |extra_info| parameter provides an opportunity to specify extra
    /// information specific to the created popup browser that will be passed to
    /// CefRenderProcessHandler::OnBrowserCreated() in the render process.
    /// </summary>
    protected virtual bool OnBeforePopup(CefBrowser browser, CefFrame frame, string targetUrl, string targetFrameName, CefWindowOpenDisposition targetDisposition, bool userGesture, CefPopupFeatures popupFeatures, CefWindowInfo windowInfo, ref CefClient client, CefBrowserSettings settings, ref CefDictionaryValue extraInfo, ref bool noJavascriptAccess)
    {
        return false;
    }


    private void on_after_created(cef_life_span_handler_t* self, cef_browser_t* browser)
    {
        CheckSelf(self);

        var m_browser = CefBrowser.FromNative(browser);

        OnAfterCreated(m_browser);
    }

    /// <summary>
    /// Called after a new browser is created. It is now safe to begin performing
    /// actions with |browser|. CefFrameHandler callbacks related to initial main
    /// frame creation will arrive before this callback. See CefFrameHandler
    /// documentation for additional usage information.
    /// </summary>
    protected virtual void OnAfterCreated(CefBrowser browser)
    {
    }


    private int do_close(cef_life_span_handler_t* self, cef_browser_t* browser)
    {
        CheckSelf(self);

        var m_browser = CefBrowser.FromNative(browser);

        return DoClose(m_browser) ? 1 : 0;
    }

    /// <summary>
    /// Called when a browser has recieved a request to close. This may result
    /// directly from a call to CefBrowserHost::*CloseBrowser() or indirectly if
    /// the browser is parented to a top-level window created by CEF and the user
    /// attempts to close that window (by clicking the 'X', for example). The
    /// DoClose() method will be called after the JavaScript 'onunload' event has
    /// been fired.
    /// An application should handle top-level owner window close notifications by
    /// calling CefBrowserHost::TryCloseBrowser() or
    /// CefBrowserHost::CloseBrowser(false) instead of allowing the window to
    /// close immediately (see the examples below). This gives CEF an opportunity
    /// to process the 'onbeforeunload' event and optionally cancel the close
    /// before DoClose() is called.
    /// When windowed rendering is enabled CEF will internally create a window or
    /// view to host the browser. In that case returning false from DoClose() will
    /// send the standard close notification to the browser's top-level owner
    /// window (e.g. WM_CLOSE on Windows, performClose: on OS X, "delete_event" on
    /// Linux or CefWindowDelegate::CanClose() callback from Views). If the
    /// browser's host window/view has already been destroyed (via view hierarchy
    /// tear-down, for example) then DoClose() will not be called for that browser
    /// since is no longer possible to cancel the close.
    /// When windowed rendering is disabled returning false from DoClose() will
    /// cause the browser object to be destroyed immediately.
    /// If the browser's top-level owner window requires a non-standard close
    /// notification then send that notification from DoClose() and return true.
    /// The CefLifeSpanHandler::OnBeforeClose() method will be called after
    /// DoClose() (if DoClose() is called) and immediately before the browser
    /// object is destroyed. The application should only exit after
    /// OnBeforeClose() has been called for all existing browsers.
    /// The below examples describe what should happen during window close when
    /// the browser is parented to an application-provided top-level window.
    /// Example 1: Using CefBrowserHost::TryCloseBrowser(). This is recommended
    /// for clients using standard close handling and windows created on the
    /// browser process UI thread.
    /// 1.  User clicks the window close button which sends a close notification
    /// to the application's top-level window.
    /// 2.  Application's top-level window receives the close notification and
    /// calls TryCloseBrowser() (which internally calls CloseBrowser(false)).
    /// TryCloseBrowser() returns false so the client cancels the window
    /// close.
    /// 3.  JavaScript 'onbeforeunload' handler executes and shows the close
    /// confirmation dialog (which can be overridden via
    /// CefJSDialogHandler::OnBeforeUnloadDialog()).
    /// 4.  User approves the close.
    /// 5.  JavaScript 'onunload' handler executes.
    /// 6.  CEF sends a close notification to the application's top-level window
    /// (because DoClose() returned false by default).
    /// 7.  Application's top-level window receives the close notification and
    /// calls TryCloseBrowser(). TryCloseBrowser() returns true so the client
    /// allows the window close.
    /// 8.  Application's top-level window is destroyed.
    /// 9.  Application's OnBeforeClose() handler is called and the browser object
    /// is destroyed.
    /// 10. Application exits by calling CefQuitMessageLoop() if no other browsers
    /// exist.
    /// Example 2: Using CefBrowserHost::CloseBrowser(false) and implementing the
    /// DoClose() callback. This is recommended for clients using non-standard
    /// close handling or windows that were not created on the browser process UI
    /// thread.
    /// 1.  User clicks the window close button which sends a close notification
    /// to the application's top-level window.
    /// 2.  Application's top-level window receives the close notification and:
    /// A. Calls CefBrowserHost::CloseBrowser(false).
    /// B. Cancels the window close.
    /// 3.  JavaScript 'onbeforeunload' handler executes and shows the close
    /// confirmation dialog (which can be overridden via
    /// CefJSDialogHandler::OnBeforeUnloadDialog()).
    /// 4.  User approves the close.
    /// 5.  JavaScript 'onunload' handler executes.
    /// 6.  Application's DoClose() handler is called. Application will:
    /// A. Set a flag to indicate that the next close attempt will be allowed.
    /// B. Return false.
    /// 7.  CEF sends an close notification to the application's top-level window.
    /// 8.  Application's top-level window receives the close notification and
    /// allows the window to close based on the flag from #6B.
    /// 9.  Application's top-level window is destroyed.
    /// 10. Application's OnBeforeClose() handler is called and the browser object
    /// is destroyed.
    /// 11. Application exits by calling CefQuitMessageLoop() if no other browsers
    /// exist.
    /// </summary>
    protected virtual bool DoClose(CefBrowser browser)
    {
        return false;
    }


    private void on_before_close(cef_life_span_handler_t* self, cef_browser_t* browser)
    {
        CheckSelf(self);

        var m_browser = CefBrowser.FromNative(browser);

        OnBeforeClose(m_browser);
    }

    /// <summary>
    /// Called just before a browser is destroyed. Release all references to the
    /// browser object and do not attempt to execute any methods on the browser
    /// object (other than IsValid, GetIdentifier or IsSame) after this callback
    /// returns. CefFrameHandler callbacks related to final main frame destruction
    /// will arrive after this callback and CefBrowser::IsValid will return false
    /// at that time. Any in-progress network requests associated with |browser|
    /// will be aborted when the browser is destroyed, and
    /// CefResourceRequestHandler callbacks related to those requests may still
    /// arrive on the IO thread after this callback. See CefFrameHandler and
    /// DoClose() documentation for additional usage information.
    /// </summary>
    protected virtual void OnBeforeClose(CefBrowser browser)
    {
    }
}
